header{
    $height:50px;
    width:100%;
    height:$height;
    background-color:#4395ff;
    padding:0 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color:#fff;
    position: relative;
    h3{
        position: absolute;
        left:0;
        top:0;
        width:100%;
        height:$height;
        line-height:$height;
        // border:1px solid red;
    }
}
